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四、覆层钢材和复合钢材钢材表面镀上保护金属(如锌、铝、锡、铬等)即成为镀层钢材,涂上非金属保护层(如油漆、塑料等)即成涂层钢材。镀层钢材和涂层钢材统称为覆层钢材。用覆层钢材代替无覆层钢材,一般可使钢材寿命延长2～5倍。因此覆层钢材目前己广泛用于汽车、建筑、电器、化工、仪表、纺织、军工、食品等方面。复合钢材是在钢材(如钢板、钢管)的一面或两面覆上不同种的钢材。一般是由普碳钢与特殊钢复合而成,如普碳钢板与不锈钢板复合,工具钢与碳钢复合等。复合钢材
Fourth, coated steel and composite steel The surface of steel plated with protective metal (such as zinc, aluminum, tin, chromium, etc.) that is coated steel, coated with non-metallic protective coating (such as paint, plastic, etc.) Serve coated steel. Coated steel and coated steel collectively referred to as coated steel. With coated steel instead of uncoated steel, steel can generally extend the life of 2 to 5 times. Therefore, the coated steel has been widely used in automobiles, construction, electrical appliances, chemicals, instruments, textiles, military, food and so on. Composite steel is in the steel (such as steel, steel) on one or both sides covered with different kinds of steel. General is made of carbon steel and special steel composite, such as carbon steel plate and stainless steel composite, tool steel and carbon steel composite. Composite steel